Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 290, Issue -, Pages 87-92Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.03.089
Keywords
Paper electrodes; Carbon nanomaterials; Gold nanoparticles; Mercury; Low-cost analysis; Decentralized analysis
Funding
- Ministerio de Economia y Competitividad (MINECO, Spain) [CTQ2013-47396-R, CTQ2011-25814, CTQ2014-58826-R, MAT2017-84959-C2-1-R]
- Consejeria de Economia y Empleo del Principado de Asturias (Plan of Science, Technology and Innovation 2013-2017) [GRUPIN14-021, GRUPIN14-022, IDI/2018/000185]
- Ministry of Economy and Competitiveness [BES-2015-072220]
- European Regional Development Fund (ERDF)
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A sensor for Hg (II) determination in water was developed by using paper working electrodes modified with nanomaterials. The cellulose matrix was modified with hybrids of carbon nanofibers (CNFs) or reduced graphene oxide (rGO) and gold nanoparticles (AuNPs), in order to increase the selectivity and sensitivity. The AuNPs helped the electrodeposition of Hg (II) at more positive potentials, due to their affinity for mercury. The determination was possible up to 1.2 mu M with no interference of other heavy metals such as Cd (II), Pb (II), Cu (II) and Zn (II). The CNFs/AuNPs modified paper-based electrode was the most sensitive option with a detection limit of 30 nM. River water samples were evaluated by the standard addition method.
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